Question

x=y-7
2x-y=-6


5x+7y=-3
8x-y=-17

Answer 1

Ответ:

$2(y - 7) - y = - 6 \\ 5(y - 7) + 7y = - 3 \\ 8(y - 7) - y = - 17 \\ y = 8 \\ y = \frac{8}{3} \\ y = \frac{39}{7}$